Web-feeding mechanism for printing-presses



O. V. DUTRO AND A. S. BURROUGHS.

WEB FEEDING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED OCLZS, IBIS.

1,312,963. Patented M 12, 1919.

' UNITED STATES PATENT oFruoE.

ORVILLE VINCENT AND ARTHUR S. BURROUG-HS, 0F SPOKANE, WASHINGTON.

WEB-FEEDING ME'HANISM FOR PRINTING PRESSES.

Specification of Letters Patent.

Patented Aug. 12, 1919.

Application filedOctober 28, 1918. Serial No 259,945.

The present nvention relates to improve- I ments in web feeding mechanism for printing presses, and the mechanism is especially adapted for use in connection with the platen and bed form or continuous sheet or web is fed to the printing mechanism. p

The primary object of the invention is the provision of a feeding device by which the continuous sheet of paper is unrolled and fed' to the printing press With uniformity and regularity, and in which the slack is taken up in the web thus preventing difliculties and delays, and by which the web is guided accurately to the bed and platen, as will be hereinafter described and claimed.

The invention consists in certain novel combinations and arrangements of parts as will be hereinafter claimed and as set forth in the accompanying drawings wherein one complete example of the physical embodiment of the invention. is illustrated, constructed and arranged according to the best mode so far devised for the-application of the principles of the inventlon.

Figure l is a side elevation of so much of a platen and bed type of printing press as is necessary to illustrate the application thereto of the present invention. 0

Fig. 2 is a top plan view of the controlling and guiding feed mechanism.

Fig. '3 is a detail view enlarged of the pivoted brake device for the web on the supply roll.

Fig. 4: is a detail view in side elevation of one of the fingers for controlling and guid ing the web as it is fed to the press.

In the-preferred form of the invention as illustrated in the drawings an exemplification of the physical embodiment of a suc cessfully operating machine is depicted wherein the web is given an intermittent 1111 by instrumentalities not illustrated, but in order to give a clear understanding of the invention the frame 1 with its platen 2 and bed 3 are pivoted to oscillate as usual, and the web tie fed to the platen and bed from.

type of press with which a the supply roll 5. The bed and platen, as

well as the other parts of the printing press are operated from the motor or'source of power supply in the customary manner, and it is'suiiicient to state here that the web 4 is drawn, intermittently, to the right in Fig. 1, the printed surface being transferred to proper place and disposed of in the well known manner.

The supply roll 5 is supported on trunnions 6 in the brackets 7 as usual, and to prevent excessive rotation of the roll to unwind the web, a brake device is employed,

which consists of the rock shaft 8, journaled in the brackets near their lower ends, and has fixed thereon the block 9 to which the brake lever 10 is fixed, a cushion or felt strip ll being attached at the end of the lever 10 and in position to bear upon the paper roll, longitudinally thereof, as seen in Fig. 1.

weight arm 12 for the lever is arranged at right angles thereto and the weight 13 on the arm may be secured in adjusted position by means of the set screw 14:, so that the lever, which is pivoted freely in the bracket through its pivot 8, follows the diminishing diameter of the paper roll and bears at all times on the surface of the roll, .thus preventing a too rapid feed of the paper. Frequently the roll is overbalanced, due to incorrect wrapping about its core, or improper centering, so that the; supply roll may have a tendency to 'swing of its own irregularly distributed weight and thus produce a slack condition of'the web, but the felt pad or cushion inthe form of a brake 11 will hold the roll against this motion.

Between the supply roll and the bed and platen is located the feed device, which controls and holds the web under tBIISIOII as it is fed to the printing devices for 18061871112,

"a form, and also prevents slipping of the web: The feed device is an attachment that is removably connected with the bench 15 of thepress, the side plates 16 of the attachment being clamped to the bench by means of the clamp screws 17 passing through the jaws 18 and by means of which the attachment may be secured in adjusted position with relation to the platen and bed.

After leaving the roll the web passes over a feed roll 19 journaled in the side plates 16 and this roll is preferably driven from an operative part of the press by a belt 20, and after passing over this roll, the web passes under the suspended roll 21 that is journaled between the two pivoted arms 22, 22 that swing on their pivot shaft 23in the side plates 16, the arms with their roll being adapted to swing within certain limits 1 as indicated by dotted linesin Fig. 1 and thusthe roll acts as a gravity device to hold the web under tension. The primary object of this feature, however, isto combine withthe feed roll 19 by causing pressure on that roll equal to theweight of the suspended roll which is sufiicient to unwind the supply roll. When enough of the supply has been will be seen when the roll 21 has assumed a suspended position there is ample slack in the web and the feed roll and sufficient grip can not be secured to turn the supply roll 5 to unwind same. As the press takes on web, tension on the web will-be increased I which will raise the suspended roll until an overbalance'is secured, causing the roll 19 to act. Thus a 'quick jerk or any shock is eliminated and a reliable and automatically adjusted feed is secured.

Following the web in Fig. 1 it passes from under the swinging roller 21 up and over the stationary guide roller 24 journaled at the upper end of the side plates 16, and from this roller the web passes directly to the platen and bed. In order to insure proper guiding and a regular and steady movement of the web over the fixed roller 24, resilient tension devices are employed, each comprising a block 25 supported on a pair of transverse bars 26 and 27 which connect the side plates 16 of the attachment. The block is laterally adjustable on these-bars, being freely slidable on the bar 26, and adapted for clamping on the bar 27 through the use of the forked end 24' of the block and the set screw 28, the latter being used to clamp the jaws of the forked or bifurcated end of the block on the bar. 7

There are two of these blocks shown and each bloclr has a resilient finger 29 with a felt pad 30 at its end to bear on one side of the web as it passes over the fixed roller 24 and guides the web against a guide'collar. One end of each, fingergis fixed to a block, and the resiliency of the" finger may i be regulated by the set screw 31 which passes through the finger and is threaded in the block. In conjunction with the resilient fingers a'pair of guide collars 32, 32 that are slidable on the bar 27 w are employed, and

these collars are adjusted, and held in adjusted position by set screws 33, to act as a guide for the edge of the web as it passes to the'platen and bed, to insure accurate feed of the web thereon.

When the resilient fingers are placed in contact with one edge ofthe web'to cause a pressure the web is caused to crowd against the collar 32 forming a final tension and acting in combination with this collar to cause the paper to be accurately guided into the press.

Thusfrom the time the web leaves the supply roll until it reaches the bed and platen where it is given an intermittent movement, the web is held under the proper tension to prevent slack and to present a smooth sheet to the printing device, and the web is fed accurately and in alinement to the printing device.

@laims:

1. The combination in a web feeding mechanism with a supply'roll and web, of an attachment having a driven roll over which the webpasses, a swing tension roll,

a supporting'bar in the attachment and an adjustable block onthe bar and retaining means for the block, a fixed roll, and a resilient-fing'er carried by the block and having a. pad bearing on the web over the fixed roll'as described.

2. The combination with a web feeding mechanism. including a supply roll and intermittent means for moving the web from the roll, ofan attachment having side plates, a pair of bars fixed in the plates, a plurality of blocks slidable on the bars and set screws for holding the blocks in adjusted position, a fixed roller over which the web passes, a resilient finger carried by each block and a set screw engaging the finger'and block for regulating the resiliency of the finger, and a pad carried at the end of each finger to bealr uponv the web as it passes over the fixed rol er.

3. The combination with a web feeding mechanism, a reel and supply web, and an v adjustable attachment including side plates, of a pair of swinging arms pivoted 1n the plates and a guide roller journaled in thearms' a pair of bars betweenthe plates and a pair of adjustable blocks on the bars, a fixed roller journaled in the plates, and a resilient finger on each block having a pad at its freeend bearing on the web 'as it passes over the fixed roller.

In testimony whereof we afiix our signas 'tures. I

ORVILLE VINCENT DUTRO. ARTHUR S. BURROUGHS. 

